Image processing devices and methods

• US 20060104521A1
• Filed: 11/15/2004
• Published: 05/18/2006
• Est. Priority Date: 11/15/2004
• Status: Abandoned Application

• Current Assignee: MediaTek, Inc.
• Original Assignee: MediaTek, Inc.
• Inventors: Teng, Shu-Wen
• Application Number:
  US10/989,108
• Publication Number:
  US 20060104521A1
• Time in Patent Office: Days
• US Class Current: 382/232
• CPC Class Codes: H04N 19/436 using parallelised computational arrangements
• CPC Class Codes: H04N 19/61 in combination with predictive coding

Abstract

Image processing devices. A motion estimation processor generates an image block according to video data. A forward discrete cosine transform module transforms the image block to a discrete cosine transformed data block segmented into a plurality of first transformed data segments, and outputs the first transformed data segments in sequence. A quantizer separately quantizes the transformed data segments and generates a quantized data block using the separately quantized data segments. An inverse quantizer separately dequantizes the quantized data segments and generates a dequantized data block using the separately dequantized data segments. An inverse discrete cosine transform module transforms the dequantized data block to an inverse discrete cosine transformed data block segmented into a plurality of second transformed data segments, and outputs the second transformed data segments in sequence.

Claims

1. An image processing device for processing an image block segmented into a plurality of first data segments arranged in a first orientation, comprising:

a forward discrete cosine transform module operative to transform the first data segments in sequence to generate a first transformed data block segmented into a plurality of first transformed data segments arranged in a second orientation, transform the first transformed data segments in sequence to generate a plurality of second transformed data segments arranged in the second orientation, and output the second transformed data segments in sequence.

2. The image processing device as claimed in claim 1, further comprising:

an inverse discrete cosine transform module operative to receive the second transformed data segments in sequence, transform the second data segments in sequence to generate a second transformed data block segmented into a plurality of third transformed data segments arranged in the first orientation, transform the third transformed data segments in sequence to generate a plurality of fourth transformed data segments arranged in the first orientation, and output the fourth transformed data segments in sequence.

3. The image processing device as claimed in claim 1, wherein a discrete cosine transformed data block is generated by the forward discrete cosine transform module using the second transformed data segments.

4. The image processing device as claimed in claim 2, wherein an inverse discrete cosine transformed data block is generated by the inverse discrete cosine transform module using the fourth transformed data segments.

5. The image processing device as claimed in claim 1, wherein the first orientation and the second orientation are perpendicular.

6. The image processing device as claimed in claim 1, wherein the first orientation is a row orientation.

7. The image processing device as claimed in claim 6, wherein the second orientation is a column orientation.

8. The image processing device as claimed in claim 1, wherein the first orientation is a column orientation.

9. The image processing device as claimed in claim 8, wherein the second orientation is a row orientation.

10. The image processing device as claimed in claim 2, wherein the first data segments, the third transformed data segments, and the fourth transformed data segments are row data segments.

11. The image processing device as claimed in claim 1, wherein the first transformed data segment, and the second transformed data segment are column data segments.

12. An image processing device for processing an image block segmented into a plurality of first data segments arranged in a first orientation, comprising:

a forward discrete cosine transform module operative to transform the first data segments in sequence to generate a first transformed data block segmented into a plurality of first transformed data segments arranged in a second orientation, transform the first transformed data segments in sequence to generate a plurality of second transformed data segments arranged in the second orientation, and output the second transformed data segments in sequence;

a quantizer operative to separately quantize the second transformed data segments and generate quantized data segments in sequence;

an inverse quantizer operative to separately dequantize the quantized data segments and generate dequantized data segments in sequence; and

an inverse discrete cosine transform module operative to transform the dequantized data segments in sequence to generate a second transformed data block segmented into a plurality of third transformed data segments arranged in the first orientation, transform the third transformed data segments in sequence to generate a plurality of fourth transformed data segments arranged in the first orientation, and output the fourth transformed data segments in sequence.

13. The image processing device as claimed in claim 12, wherein a quantized data block is generated by the quantizer using the separately quantized data segments.

14. The image processing device as claimed in claim 12, wherein a discrete cosine transformed data block is generated by the forward discrete cosine transform module using the second transformed data segments.

15. The image processing device as claimed in claim 12, wherein an inverse discrete cosine transformed data block is generated by the inverse discrete cosine transform module using the fourth transformed data segments.

16. The image processing device as claimed in claim 13, further comprising:

a scan device operative to scan the quantized data block and transform the quantized data block into serial string data; and

a variable-length coding device operative to variable-length encode the serial string data to generate compressed data.

17. The image processing device as claimed in claim 12, wherein the first orientation and the second orientation are perpendicular.

18. The image processing device as claimed in claim 12, wherein the first orientation is a row orientation.

19. The image processing device as claimed in claim 18, wherein the second orientation is a column orientation.

20. The image processing device as claimed in claim 12, wherein the first orientation is a column orientation.

21. The image processing device as claimed in claim 20, wherein the second orientation is a row orientation.

22. The image processing device as claimed in claim 12, wherein the first data segment, the third transformed data segment, and the fourth transformed data segment are row data segments.

23. The image processing device as claimed in claim 12, wherein the first transformed data segment, the second transformed data segment, the quantized data segment, and the dequantized data segment are column data segments.

24. The image processing device as claimed in claim 12, further comprising a motion estimation processor operative to generate the image block according to video data.

25. The image processing device as claimed in claim 24, wherein the motion estimation processor comprises:

a memory operative to store reference data;

a subtracter operative to obtain a difference between the video data and the reference data; and

an adder operative to add the reference data and the fourth transformed data segment, and update the reference data in the memory.

26. An image processing device, comprising:

a motion estimation processor operative to generate an image block according to video data;

a forward discrete cosine transform module operative to transform the image block to a discrete cosine transformed data block segmented into a plurality of first transformed data segments, and outputt the first transformed data segments in sequence;

a quantizer operative to separately quantize the transformed data segments and generating a quantized data block using the separately quantized data segments;

an inverse quantizer operative to separately dequantize the quantized data segments and generating a dequantized data block using the separately dequantized data segments; and

an inverse discrete cosine transform module operative to transform the dequantized data block to an inverse discrete cosine transformed data block segmented into a plurality of second transformed data segments, and output the second transformed data segments in sequence.

27. The image processing device as claimed in claim 26, wherein the image block is segmented into a plurality of image segments, and the motion estimation processor outputs the image segments in sequence.

28. The image processing device as claimed in claim 26, wherein the forward discrete cosine transform module combines the image segments to the image block.

29. The image processing device as claimed in claim 26, further comprising:

a scan device operative to scan the quantized data block, and transform the quantized data block into serial string data; and

a variable-length coding device operative to variable-length encode the serial string data to generate compressed data.

30. The image processing device as claimed in claim 26, wherein the inverse quantizer outputs the dequantized data segments in sequence.

31. The image processing device as claimed in claim 26, wherein the inverse discrete cosine transform module combines the dequantized data segments to the dequantized data block.

32. The image processing device as claimed in claim 26, wherein the motion estimation processor comprises:

a memory operative to store reference data;

a subtracter operative to obtain a difference between the video data and the reference data; and

an adder operative to add the reference data and the second transformed data segment, and update the reference data in the memory.

33. The image processing device as claimed in claim 26, wherein the first transformed data segment is column data of the transformed data block.

34. The image processing device as claimed in claim 26, wherein the quantized data segment is column data of the quantized data block.

35. The image processing device as claimed in claim 26, wherein the image segment is row data of the image block.

36. The image processing device as claimed in claim 26, wherein the dequantized data segment is column data of the dequantized data block.

37. The image processing device as claimed in claim 26, wherein the second transformed data segment is row data of the inverse discrete cosine transformed data block.

38. An image processing method, comprising:

providing an image block segmented into a plurality of first data segments arranged in a first orientation;

discrete cosine transforming the first data segments in sequence to generate a first transformed data block segmented into a plurality of first transformed data segments arranged in a second orientation, the first transformed data segments in sequence to generate a plurality of second transformed data segments arranged in the second orientation, and outputting the second transformed data segments in sequence;

separately quantizing the second transformed data segments to generate quantized data segments in sequence;

separately dequantizing the quantized data segments to generate dequantized data segments in sequence;

inverse discrete cosine transforming the dequantized data segments in sequence to generate a second transformed data block segmented into a plurality of third transformed data segments arranged in the first orientation, and the third transformed data segments in sequence to generate a plurality of fourth transformed data segments arranged in the first orientation, and outputting the fourth transformed data segments in sequence; and

outputting the fourth transformed data segments in sequence.

39. The image processing method as claimed in claim 38, further comprising:

scanning the quantized data block and transforming the quantized data block into serial string data; and

variable-length encoding the serial string data to generate compressed data.

40. The image processing method as claimed in claim 38, wherein the first orientation and the second orientation are perpendicular.

41. The image processing method as claimed in claim 38, wherein the first orientation is a row orientation.

42. The image processing device as claimed in claim 41, wherein the second orientation is a column orientation.

43. The image processing method as claimed in claim 38, wherein the first data segments, the third transformed data segments, and the fourth transformed data segments are row data segments.

44. The image processing method as claimed in claim 38, wherein the first transformed data segments, the second transformed data segments, the quantized data segments, and the dequantized data segments are column data segments.

45. The image processing method as claimed in claim 38, further comprising:

storing reference data;

obtaining a difference between the video data and the reference data; and

updating the reference data by adding the reference data and the fourth transformed data segment.

46. An image processing device, comprising:

means for providing an image block segmented into a plurality of first data segments arranged in a first orientation;

means for discrete cosine transforming the first data segments in sequence to generate a first transformed data block segmented into a plurality of first transformed data segments arranged in a second orientation, and the first transformed data segments in sequence to generate a plurality of second transformed data segments arranged in the second orientation;

means for outputting the second transformed data segments in sequence;

means for separately quantizing the second transformed data segments to generate quantized data segments in sequence;

means for separately dequantizing the quantized data segments to generate dequantized data segments in sequence;

means for inverse discrete cosine transforming the dequantized data segments in sequence to generate a second transformed data block segmented into a plurality of third transformed data segments arranged in the first orientation, and the third transformed data segments in sequence to generate a plurality of fourth transformed data segments arranged in the first orientation

means for outputting the fourth transformed data segments in sequence; and

means for outputting the fourth transformed data segments in sequence.

47. The image processing device as claimed in claim 46, further comprising:

means for scanning the quantized data block and transforming the quantized data block into serial string data; and

means for variable-length encoding the serial string data to generate compressed data.

48. The image processing device as claimed in claim 46, wherein the first orientation and the second orientation are perpendicular.

49. The image processing device as claimed in claim 46, wherein the first orientation is a row orientation.

50. The image processing device as claimed in claim 49, wherein the second orientation is a column orientation.

51. The image processing device as claimed in claim 46, wherein the first data segments, the third transformed data segments, and the fourth transformed data segments are row data segments.

52. The image processing device as claimed in claim 46, wherein the first transformed data segments, the second transformed data segments, the quantized data segments, and the dequantized data segments are column data segments.

53. The image processing device as claimed in claim 46, further comprising:

storing reference data;

obtaining a difference between the video data and the reference data; and

updating the reference data by adding the reference data and the fourth transformed data segment.